IGN-28024 Fix misleading message when connecting to a starting node

[Pochatkin]

Summary

• When connecting to a node that is still starting, the CLI showed "The cluster is not initialized. Run cluster init..." which is misleading for nodes that are simply restarting
• Changed the message to: "The cluster is not initialized or the node has not finished starting yet" with instructions for both cases
• The 409 CONFLICT from the REST filter is returned both when the cluster isn't initialized AND when a node is restarting (REST state is NOT_INITIALIZED in both cases)

Test plan

• Start a node in an already-initialized cluster and immediately connect — verify the new message
• Connect to a fresh cluster that was never initialized — verify the new message includes cluster init instructions
• Run ItNotInitializedClusterReplTest integration test

🤖 Generated with Claude Code